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Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation
Published on: March 9, 2018
Reactivity, vibrational spectroscopy, internal rotation and thermochemical aspects of methylarsine
1Departamento de Química e Física Molecular, Instituto de Química de São Carlos, Universidade de São Paulo, USP, São Carlos, SP, Brazil.
Abstract:
The aim of this investigation was to perform a characterization of the spectroscopic and thermodynamic properties of methylarsine (CH3AsH2). Post-Hartree-Fock, 29 DFT methods and eight different composite methodologies were employed in these analyses. A comparison between harmonic and anharmonic frequency accuracies in reproducing the observable frequencies was performed here. In addition, the CH3AsH2→CH2AsH3 isomerization barrier energy was estimated in 100kcalmol-1, whereas the H2-release routes barrier heights were in the 45-107kcalmol-1 range. A rate constant of 10-66s-1 was predicted regarding the isomerization route, while the CH2AsH3 hydrogen elimination mechanism is faster than the methylarsine one. The transition state structure of the CH3AsH2 internal rotational barrier energy varied between 1.0 and 1.4kcalmol-1. For the CH2AsH3 internal rotation the estimated barrier heights varied 0.6-2.5kcalmol-1. The adiabatic ionization energy and the heat of formation each structure was also calculated here.
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